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//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
#ifndef Patternist_EmptySequence_H
#define Patternist_EmptySequence_H
#include "qemptycontainer_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Implements the value instance of empty sequence: ().
*
* @author Frans Englich
* @ingroup Patternist_xdm
*/
class EmptySequence : public EmptyContainer
{
public:
/**
* @short Creates an EmptySequence that is a replacement for @p
* replacementFor.
*
* @see EmptySequence()
*/
static Expression::Ptr create(const Expression *const replacementFor,
const StaticContext::Ptr &context);
/**
* @short Creates an instance of EmptySequence.
*
* @note In most cases create() should be used, since it takes care of
* adjusting source location annotations.
*
* @see create()
*/
inline EmptySequence()
{
}
virtual QString stringValue() const;
/**
* @returns always an empty iterator, an instance of EmptyIterator.
*/
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const;
/**
* @returns always @c null.
*/
virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;
/**
* Does nothing.
*/
virtual void evaluateToSequenceReceiver(const DynamicContext::Ptr &) const;
/**
* @returns always @c false.
*/
virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
/**
* @returns always CommonSequenceTypes::Empty
*/
virtual ItemType::Ptr type() const;
/**
* @returns always CommonSequenceTypes::Empty
*/
virtual SequenceType::Ptr staticType() const;
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
virtual ID id() const;
virtual Properties properties() const;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif